We tried for a baby for six months and nothing happened...then we stopped trying...

We actually conceived almost 18 months later, on a month when we thought it was totally impossible - neither of us were feeling great, we'd only had sex twice in the month (!) and neither time was around my ovulation dates.

I nearly fell off the toilet in shock when the test came up positive!!

So I'd go with the 'just relax' advice - although I know it's easier said than done :o)